package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements I0Peration{

    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书");
        //1.你要删除的这本书是否存在
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书姓名");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();
        int delIndex = -1;//记录下标
        int i ;
        for(i = 0;i <currentSize;i++){
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)){
                System.out.println("找到这本书，开始删除");
                delIndex = i;
                break;
            }
        }
        if(i == currentSize){
            System.out.println("没有你要删除的这本书");
            return;
        }

        for(int j = delIndex;j<currentSize-1;j++){
            //[j] = [j+1]
            Book book = bookList.getBook(j+1);
            bookList.setBooks(j,book);
        }

        bookList.setBooks(currentSize-1,null);//下标为这个的地方的对象置空
        bookList.setUsedSize(currentSize-1);
        System.out.println("删除图书成功");
    }
}
